Infrared photodissociation spectra of the C–H stretch vibrations of C6H6+–Ar, C6H6+–N2, and C6H6+–(CH4)1–4

摘要: Vibrational infrared photodissociation spectra of mass selected C6H6+–Ar, C6H6+–N2, and C6H6+–(CH4)1–4 ionic complexes are recorded in the spectral range C–H stretching vibrations. Transitions at 3095±15 cm−1 occur all assigned to stretch fundamentals benzene cation its 2E1g electronic ground state. In case complexes, additional transitions 2904±7 3010±24 observed attributed symmetric antisymmetric vibrations CH4 ligands, ν1 ν3. The deduced C6H6+ state roughly 30 higher than corresponding frequencies 1A1g neutral species, indicating that bonds become stronger upon removal an electron from highest occupied e1g orbital C6H6.